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Finding the Fourth Proportional to 18,879.99, 28,299.24 and 7,780.62

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Solution

The fourth proportional to 18,879.99, 28,299.24 and 7,780.62 is: 11,662.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.99 : 28,299.24 = 7,780.62 : x
  2. Step 2: Convert to fraction form
    18,879.99/28,299.24 = 7,780.62/x
  3. Step 3: Cross multiply
    18,879.99x = 28,299.24 × 7,780.62
  4. Step 4: Simplify right side
    18,879.99x = 220,185,738.85
  5. Step 5: Solve for x
    x = 220,185,738.85/18,879.99
  6. Step 6: Final answer
    x = 11,662.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.